[llvm-reduce] Fix incorrectly ignored null MD in ReduceDIMetadata (#108541) Commit c2e62c7 updated the ReduceDIMetadata pass to be able to remove DIGlobalVariableExpressions from MDNode operands; it also accidentally prevented null operands from being preserved, which results in an assertion being triggered: `Targets == NoChunksCounter.count() && "number of chunks changes when reducing"' This patch allows us to correctly preserve null operands once again. I've not got a test case for this yet - I'm hoping this patch is just trivially correct as-is, because I've not got the hang of reducing a test case for llvm-reduce yet, but I can get a test case generated if needed.
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